MCCB 400H Frame, 240A-400A Adjustable Thermal, 50kA - 3 Pole & 4 Pole | Onesto KCM5

The Onesto KCM5 400H Frame MCCB is an adjustable thermal-magnetic moulded case circuit breaker for mixed load protection, letting you fine-tune the current setting within each marked band instead of being locked to one fixed rating. It is suitable for electricians, panel builders, contractors and maintenance teams who need protection that can be set to match the actual load on industrial and larger commercial distribution boards. Available in two adjustable current bands from 240A to 400A, in both 3 Pole and 4 Pole configurations.

• Application: Suitable for main distribution boards, motor control centres and heavy machinery feeder circuits
• Key specification: Adjustable thermal 0.8-1 x In, fixed magnetic trip above 10 x In, 50kA Icu / 35kA Ics @ 400V, 690V rated operating voltage
• Current range: 240-300A or 320-400A
• Pole configuration: Available in 3 Pole or 4 Pole
• Build quality: SABS approved to IEC 60947-2 / SANS 556-1, 400H frame

Key Features

• Adjustable thermal trip lets you set the protection point within each band, reducing the number of fixed ratings you need to stock
• Fixed magnetic trip above 10 x In for fast short-circuit clearance
• Moulded case construction for durability in panel and enclosure installations
• Rated for continuous operation at 690VAC, 50/60Hz
• Compatible with matching shunt release, auxiliary contacts, alarm contacts, under-voltage release and vari-depth handle accessories for the 400H frame range

Typical Applications

• Industrial and commercial main distribution boards
• Motor control centres
• Heavy machinery feeder protection
• Generator and genset protection circuits
• Sub-main protection on larger installations where load current may vary or grow

Technical Specifications

What's Included

• 1 x Onesto KCM5 400H Frame Adjustable Thermal MCCB (as per selected current band and pole configuration)

Please note: Enclosures, shunt release, auxiliary contacts, alarm contacts, under-voltage release, vari-depth handles and extension connectors are not included and are available separately.

Installation & Compatibility Notes

• Confirm the required current band and number of poles before ordering.
• The thermal setting is adjustable only within the marked band (0.8-1 x In) — select the band that covers your actual load current, not just the closest number.
• Confirm the breaker will be installed in a suitable enclosure rated for the 400H frame size.
• Installation must be carried out by a suitably qualified electrician in accordance with local electrical regulations.

Warranty & Support

This product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms.

Zisabo supplies quality plumbing, pump, filtration and electrical products with practical support to help customers choose the correct item for their application. If you are unsure whether this product is suitable, contact us before ordering and our team will assist where possible.

Need help choosing? If you are unsure which current band or pole configuration is correct for your board, contact Zisabo with your application details and we will assist where possible.